摘要:
A thermal oxidation method for producing a semiconductor device having a capacitor insulating film structure capable of making a thin film having a small leakage current and small temperature dependence of the leakage current. In the insulating film, a silicon nitride film with a small electron mobility and a silicon oxide film with a small hole mobility are alternately laminated in order of the nitride film/oxide film/nitride film/oxide film from a lower electrode side. A current component such as electrons flowing in this insulating film structure is limited by the layer with the smaller mobility to reduce the leakage current. An oxide film thickness of approximately several .ANG. can thus be strictly controlled. By forming the silicon nitride film between the high dielectric oxide film and the electrode, the reaction of the silicon electrode and the high dielectric oxide film can be prevented.
摘要:
To improve reliability by preventing separation of a sheet material attached on a flexible printed circuit, provided is a flexible printed circuit including a printed board body and a reinforcing board. A leaked portion of an adhesive agent is formed to leak in an outward direction relative to an end surface of the reinforcing board. The leaked portion adheres to part of the end surface of the reinforcing board to be continuous from a lower end of the end surface to form an inclined surface tapered in the outward direction. The leaked portion is formed such that a portion thereof that covers the end surface has an adhesion height hA, as measured from an adhesive surface of the reinforcing board, of greater than 0% and not greater than 80% of the thickness H1 of the reinforcing board.
摘要:
A method of manufacturing a printed circuit board includes: forming a copper layer of an interconnection pattern on a base film; laminating a cover lay on the base film so as to expose a part of the copper layer from the cover lay and cover the copper layer by the cover lay; mechanically polishing at least the exposed portion of the copper layer; and performing a plating process on the exposed portion of the copper layer so as to form a plated layer on the copper layer, and the angles α1 and α2 between the polishing direction of the exposed portion of the copper layer and the bending lines C1 and C2 satisfy the following formula (1): 30°≦α1 and α2≦150° (1).
摘要:
A socket contact terminal for electrical connection between a connection portion formed of a metal conductor on a printed circuit board and a connection terminal of an IC package. The contact terminal comprises a metal terminal composed of a main columnar portion and arm portions on both sides and having an angular U shape and an elastomeric member attached to the metal terminal. A metal surface is exposed from the outer surface of each arm portion. The elastomeric member is firmly held between the arm portions of the metal terminal and exhibits a repulsive force when the arm portions are pressed in the direction that the arm portions approach each other.
摘要:
A diffusion layer (102) is formed in the surface region of a semiconductor substrate (101). A control gate electrode (103) is formed on the substrate. An interlayer dielectric film (108) covers the entire surface of the substrate. A drain leader line (104) made of a semiconductor such as n-type polysilicon is led from the drain region, and a source leader line (107) is led from the source region through the interlayer dielectric film. The drain leader line is surrounded by an annular floating gate (105). In erase, for example, the control gate is set to a ground potential, and a positive voltage is applied to the drain leader line to remove electrons in the floating gate to the drain leader line. In write, positive voltages are applied to the control gate electrode and drain leader line to generate CHE and inject hot electrons into the floating gate. This allows to thin the gate insulating film of a flash memory, increase the degree of integration of a nonvolatile memory, and lower the driving voltage.
摘要:
A semiconductor device 100 comprises a silicon substrate 102, an N-type MOSFET 118 including a high concentration-high dielectric constant film 108b formed on the silicon substrate 102 and a polycrystalline silicon film 114, and a P-type MOSFET 120 including a low concentration-high dielectric constant film 108a and a polycrystalline silicon film 114 formed on the semiconductor substrate 102 to be juxtaposed to the N-type MOSFET 118. The low concentration-high dielectric constant film 108a and the high concentration-high dielectric constant film 108b are composed of a material containing one or more element (s) selected from a group consisting of Hf and Zr. The concentration of the above-described metallic element contained in the low concentration-high dielectric constant film 108a is lower than that contained in the high concentration-high dielectric constant film 108b.
摘要:
A semiconductor device provided with a MIS type field effect transistor comprising a silicon substrate, a gate insulating film having a high-dielectric-constant metal oxide film which is formed on the silicon substrate via a silicon containing insulating film, a silicon-containing gate electrode formed on the gate insulating film, and a sidewall including, as a constituting material, silicon oxide on a lateral face side of the gate electrode, wherein a silicon nitride film is interposed between the sidewall and at least the lateral face of the gate electrode. This semiconductor device, although having a fine structure with a small gate length, is capable of low power consumption and fast operation.
摘要:
Ingredient gas is first supplied into a reacting section disposed in an apparatus for chemical vapor deposition. Subsequently, a silicon film is deposited on a wafer under a condition that temperature at the upstream side of a direction of the ingredient gas flow inside the reacting section is higher than that at the downstream side thereof.
摘要:
In a semiconductor device, such as a memory cell, including a capacitor, a corrugated electrode is used as a lower electrode of the capacitor and is covered with an insulation film to be opposed to an upper electrode. The corrugated electrode is specified in section by a series of folded portions which are alternately folded vertically and horizontally. Practically, the corrugated electrode is formed by a corrugated wall which surrounds a hollow space and which has a rectangular or a polygonal shape on a plane. Alternatively, the corrugated wall has an irregular surface formed by an aggregation of grains so as to effectively widen a surface of the lower electrode. Such a corrugated electrode may be manufactured by a mold which is formed by selectively etching a stack of first-kind spacer films and second-kind spacer films.
摘要:
In order to study an etching rate difference of a layer formed mainly with silicon dioxide on a wafer, a thermal oxide film (113) and layers of BSG (117), BPSG (125), and PSG (129) are laminated on a wafer and are etched in a gaseous etching atmosphere consisting essentially of hydrogen fluoride or a mixture of hydrogen fluoride and water vapor. The layers are etched with various etching rates which are higher than that of the thermal oxide film. The etching rate difference is a difference between the etching rate of each layer and an etching rate of the thermal oxide film. The layers may include impurities, such as boron and phosphorus, collectively as a part of a layer material of each layer. The etching rate difference depends on the layer material. Preferably, the gaseous etching atmosphere should have a reduced pressure. Alternatively, a water vapor partial pressure should not be greater than 2000 Pa. As a further alternative, either the layer or the gaseous etching atmosphere should be heated.